There is a $3 million bounty for the info about Nemcov's killing:
http://www.forbes.ru/news/281601-skr-poobeshchal-3-mln-rublei-za-tsennuyu-informatsiyu-ob-ubiistve-nemtsova


She refuses to make use of Russian witness protection program. She is now under guard as a witness, however her lawyer demands that she is let go:
http://ria.ru/incidents/20150301/1050270226.html
And an interesting twist of events. Official Kiev sent a note to Russian Ministry of Foreign affairs demanding that Durickaja is immediately sent to Ukraine. Makes you think why all the fuss from Kiev?
http://www.vz.ru/news/2015/3/1/732083.html?jkl

And another twist, connecting to Ukraine. A march in memory of Nemcov was organised, counting 21000 participants (on such short notice: Charlie Hebdo, anyone?!). One of the participants was the present MP of Ukraine, Goncharenko, who was a present at the Odessa massacre last year and is suspected of burning people. He's been arrested on these charges:
http://www.vz.ru/news/2015/3/1/732084.html

And, finally, Nemcov's murder was caught on camera, and the events can be fully reconstructed:
http://www.tvc.ru/news/show/id/62541